Two Shivas or one Blueprint 1503? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd February 2004, 10:16 PM   #1
Wayne P is offline Wayne P  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Texas
Default Two Shivas or one Blueprint 1503?

Hello,

First post here, so please be gentle with a noob. I know Im probably a pretty lame DIYer compared to the rest of you guys, but here goes.

Heres the deal: Currently I have a pair of passive 12 Shivas, each in a 2.5 cubic ft. sealed box. The boxes are old tower speakers that I drafted for the job because they were laying around, and theyre stacked on their sides in a corner. Yes, it looks pretty pitiful.

I have a chance to get from a friend a passive sub in a nice-looking 3.5 cubic ft. box. It has a 15 driver in it. However, Ive never been particularly impressed with the way this thing performed at his place, so Id probably like to replace the driver with something more capable.

I love the two Shivas, but they struggle in my huge room (6200 cubic ft.) on the most demanding action flicks, since Ive had to equalize them pretty drastically to get solid extension down to 25Hz. So it would be nice if I could not only make a visual improvement, but also a performance improvement. I dont think the latter would have to be drastic probably a 15-20% improvement would be more than adequate.

I posted this question on another forum and someone recommended the Blueprint 1503 as a driver in a box that size that would deliver the goods as well or better than the two Shivas. I would like do know what you folks think about this, or perhaps recommend a different 15 driver for me.

Thanks in advance.

Regards,
Wayne A. Pflughaupt
  Reply With Quote
Old 24th February 2004, 02:01 AM   #2
diyAudio Member
 
mikee12345's Avatar
 
Join Date: Nov 2002
Location: NZ
Well your problem is in the alignment not the driver
You arent getting the optimal response from the shiva

2.5cubes sealed has no lows,and your expecting lows and EQINg it , very bad. EQing a sealed box will result in extremely high excursion,limiting SPL .

Atleast if u EQ a ported box near its tuning the excursion doesnt increase TOO badly...

Can you fit 4 cubes ported for each sub?


btw 2 12"s have same area as 1 15" ,so then all u can do to compare is-
-box size compare(in the right box for each)
-Volume displacement
-Sound quality of each

Cheers!

edit=each horizontal line on that graph is 6db
Attached Images
File Type: jpg gain.jpg (24.8 KB, 125 views)
  Reply With Quote
Old 24th February 2004, 02:24 AM   #3
Wizard of Kelts
diyAudio Moderator
 
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
Wayne:

Are they still making Blueprints? If so, where can you get them.
__________________
"A friend will help you move. A really good friend will help you move a body."
-Anonymous
  Reply With Quote
Old 24th February 2004, 02:27 AM   #4
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default speaking of Shiva

the moonless night in February -- for those of you who have studied your comparative theology.
  Reply With Quote
Old 24th February 2004, 02:27 AM   #5
diyAudio Member
 
Tieftoener's Avatar
 
Join Date: Nov 2002
Location: Coastal AL
mikee12345 is right on. You want to put those things in a vented ~3.3 ft^3 cabinet, or perhaps slightly different vented. Look at the Shiva Whitepaper for more info. For HT, you definetly want to go vented. I recommend one of the big flared ports for this job - when my Shiva's are crankin, they move A LOT of air. I actually only have one in my HT now, filling a room of ~4000ft^3. And it's more than enough, even with action from Terminator 3 or the like.

Good luck,
__________________
Tieftoener -- You're ears can sense a movement in air that causes your eardrum to move less than 1/10th of the diameter of a Hydrogen atom! Don't abuse the one of the most amazing organs your Creator gave you!
  Reply With Quote
Old 24th February 2004, 02:28 AM   #6
Wizard of Kelts
diyAudio Moderator
 
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
Quote:
Originally posted by mikee12345

btw 2 12"s have same area as 1 15" ,so then all u can do to compare is-
-box size compare(in the right box for each)
-Volume displacement
-Sound quality of each

Cheers!

Actually, Mike, I think the rule of thumb is that two 10 inchers have the same cone area as one 15 incher.

Two 8 inchers have the same cone area as one 12 incher.

But you are not so far off.
__________________
"A friend will help you move. A really good friend will help you move a body."
-Anonymous
  Reply With Quote
Old 24th February 2004, 03:40 AM   #7
diyAudio Member
 
mikee12345's Avatar
 
Join Date: Nov 2002
Location: NZ
oh oooops,whats 200cm^2 between fellow diyers:P

acoustic-visions sells blueprint apprently,see the diysubwoofers.org forum

Gota run!
  Reply With Quote
Old 24th February 2004, 03:42 AM   #8
diyAudio Member
 
Join Date: Oct 2001
Location: 5280'
Some of the original BluePrint drivers are still available HERE

Also there is some online chatter that production will start up again
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Blueprint 1503 15" subwoofer and Nady Audio XA-1100 power amp needtubes Swap Meet 8 21st August 2007 10:36 PM
FS: Blueprint 1503 theNoid Subwoofers 0 28th September 2005 12:34 PM
Which specs should I use to model my BPD 1503? needtubes Subwoofers 2 13th February 2005 05:13 PM
IB gurus: Tempest vs. BPD 1503 for organs and explosions VDoran Subwoofers 2 8th January 2002 05:13 PM
does someone know the max rms power rating of the Blueprint 1503 driver? pkgum Multi-Way 3 9th December 2001 01:50 PM


New To Site? Need Help?

All times are GMT. The time now is 06:44 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2